Now when performing a backup you can specify extra folders
or files to backup (in addition to the defaults).
Now all the folders starting with "meta-" will be backed up.
The restore tool has been updated to support the above mentioned
improvements.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

upgrade_oniro now will upgrade and merge the bblayers
without performing any checks, also the output of the script is
just for debug as of now. Bugs may be present.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Add error handling for restore in case the backup is not found.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Now restore is able to find the latest backup without user
intervention.
Backup will not crash anymore if used without build_directory
set to a correct directory, default is now None.
Rename backup_archive_path to backup_archive_arg to better
represent its meaning.
Add TODOs.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Add upgrade, backup and restore subcommands.
With these the user is able to perform different functions
of the script easily.
The functions are not jet implemented.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Now in the backup it's saved a metadata file containing
all the folders that have been backed up. This is used
when restoring it, in fact we need to delete those otherwise
added files in the upgrade are not deleted and we may end up
with an inconsistent build.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

With the --store-backup option the backup is stored
even if the upgrade was successful.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

The --dry-run option is not yet implemented but with
this commit it has been added to the list of parsed options.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Convert required options to positional arguments.
Required options are not a good idea because it can be
confusing for the user have an option (that should be
optional) required for running the script.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Implment backup_oniro, now the script can backup the project so
that in case something goes wrong in the upgrade we can restore
the initial state (this function is not yer implement).
Add TODOs.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Move upgrade_oniro.py in upgrade_oniro directory.
Create utils python lib, this will collect utils functions
used in the main scirpt.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Add global script options.
Change function name arg_parsing -> init_script_options to reflect
better the behevior of the function.

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>